I think that’s a difficult argument to sell unless you’re in a top 100 or whatever alliance, and even then it’d be really hard to convince me of all people on it.
For example I tagged my alt in just some random alliance just to experiment, the only remarkable feature is just how average the alliance is. Not awesome, not bad; not highly social but there’s some chatter; has killed a 7* so not a dazed and confused one but there’s zero management of this current titan which is heading towards an escape and that was predictable based on their last titan performance… and their alliance score is 80k: i.e., not in the top 100, and therefore unranked. Average.
It’s one thing if you’re in the top 10, my main plays below what I could play at cup-wise and I’ve taken some crap for it in a top 10 alliance according to the leaderboard for the past few weeks, but cups just don’t have much intrinsic value to the game and the alliance argument is a difficult thing to convince membership of (titan score is way more important from an alliance scoring perspective) so even in the top handful of alliances, if you can tap the titan hard, cups are sorta /shrug.